For enduro and light motocross use.

Modifications

ECU: de-restrict

Exhaust: handmade, no catalytic converter, same diameter as head pipe (o2 sensor cheat with two small resistances), remove air suction system, a resistance cheats sensor too.

Sparkplug: ngk cr9eix iridium (excellent idle).

Front sprocket: 13t JT.

Rear sprocket: 44t JT, (with this combination there’s no need for longer chain).

Intake: remove air filter cover, air temperature sensor cheat with a small resistance (always -5 Celsius).

Rear tire: metzeler mc5 +side screws (helps on mud hillsides).

Front tire: re-grooved dunlop d605 (until it melts).

Weight reduction: removed anything unnecessary like headlight, lcd speedometer, rear seat bag, turn signals, metal and plastic parts, wires etc. Approximately save 22 kg. (not bad!).

Sub frame: just cut it…

More mods in near feature (like suspension, electric starter remove, may be a 300cc kit with a versys 650 injector etc).

Spyros from Greece

My English isn’t very good but I’ll try to answer any question.

Thanx!

 

How many miles on your chain before putting the 44t?

 

i would put a bash plate and bark busters on that mods list. Could almost fool someone its a kx250f without the headlight

 

12000km ~ 7500miles

modification continues

any new ideas welcome

 

Wow, 44 kilos. That thing is almost as light as a 2 stroke!
Nice work!

 

22 kilos; 44.+ lbs.

 

Doh, I was converting the numbers but not units of measure.
22 kilos; 44.+ lbs. - Yeah I knew that, really. Really, I was a chem minor, we only dealt in metric.

 

Your english looks fine to me.
Pictures are worth a thousand words.
Nice bike Spyros!
Dan

 

air temperature sensor cheat with a small resistance (always -5 Celsius).



[/FONT][/QUOTE]

I like the new look Spyros. Tell me more about the sensor cheats. Is that to get richer EFI mix?

 

I like the new look Spyros. Tell me more about the sensor cheats. Is that to get richer EFI mix?[/QUOTE]

Yes, with a 3.3Kohm resistor in air temperature sensor the mixture enriched a lot.
May be FI ligth turns on.

Worst Consumption
Better Performance

and two 220ohm resistors for the O2 sensor.

Also thermostat removed for better coolant circulation.